When to contact doctor

Kayla • My husband and i are both 28. We each have 2 children from prior marriages, 4 in total! We are ttc our 5th, but have had 2 miscarriages.
I have 2 children, 7 &3, but both pregnancies took about 2 years of ttc before concieving. I have been ttc for 6 months. I did ovulation tests for the first time last month and just started this month. I have had an lh surve the day after af both times. Should i contact my doctor to see if i have a lfd, or wait a while?